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1. [AMPS] Band Switch Heath SB-1000 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sun, 27 Apr 1997 11:14:03 -0400; This is good advice. Parasitics are absolutely NOT the cause of switch arcing. This is quite easy to understand, if you look at the tank layout and understand ohms law. The anode of the tube is shunt; /archives//html/Amps/1997-04/msg00426.html (11,153 bytes)
2. [AMPS] Amp Supply History (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 26 Apr 1997 15:05:01 -0400; <snip> Carl, I agree with you. I don't think anyones personal life is a topic for this reflector. Denny's divorce or personal life is none of anyone's business. It is sufficent to say the business di; /archives//html/Amps/1997-04/msg00414.html (7,755 bytes)
3. [AMPS] SB-230 still works fine. (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 25 Apr 1997 21:45:00 -0400; The primary problems with the SB-230 are: 1.) It has no grid protection circuit. The grid is easily damaged by load faults or mistuning 2.) It has no surge limiting resistance in the anode. If the tu; /archives//html/Amps/1997-04/msg00404.html (7,243 bytes)
4. [AMPS] Amp Supply History (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 25 Apr 1997 21:38:16 -0400; I wasn't going to post anything, but I see corrections are in order. First some history. I looked at Dentron's records as a favor for a friend of mine who was VP of a bank holding a note for Dentron; /archives//html/Amps/1997-04/msg00403.html (9,544 bytes)
5. [AMPS] : WHY ARE THE TURNS SHORTED? (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 24 Apr 1997 19:05:01 -0400; Hi Carl, The turns are shorted for two engineering reasons. 1.) To prevent unwanted stray resonances 2.) To prevent auto-transformer effects from creating excessive voltages. Shorted turns generally; /archives//html/Amps/1997-04/msg00387.html (8,077 bytes)
6. [AMPS] Single band amp construction query (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 24 Apr 1997 10:31:25 -0400; Hi Carl, Which of the changes you made made the most difference? Was it the layout, Q, input circuit, or components? 73 Tom -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@cont; /archives//html/Amps/1997-04/msg00384.html (9,141 bytes)
7. [AMPS] Type-accept ? (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Wed, 23 Apr 1997 22:28:59 -0400; Hi Dave, No, not all amps. All amps for operation below 144 MHz must be type accepted, or meet the requirements of type acceptance or certification. There are exceptions allowing a ham to build one a; /archives//html/Amps/1997-04/msg00369.html (9,443 bytes)
8. [AMPS] part 97 1500 W out (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 05 Apr 1997 07:46:33 -0500; Hi Pete, Key down CW power is the same as PEP CW power if the envelope has no distortion or amplitude modulation, but when you switch from CW to SSB the output power generally goes up. The reason for; /archives//html/Amps/1997-04/msg00124.html (8,079 bytes)
9. [AMPS] part 97 1500 W out (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 04 Apr 1997 15:13:24 -0500; Section 97.313b covers this. "No station may transmit with a transmitter power exceeding 1500 watts PEP." Transmitter power. Not common point or feedline power. Broadcast stations are assigned an ERP; /archives//html/Amps/1997-04/msg00118.html (7,453 bytes)
10. [AMPS] SB1000 grid current (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 04 Apr 1997 14:49:45 -0500; Hi Chris, If grid heating was due to resistive losses, the grid would also have a current rating. The grid is heated by conducted and radiated heat from the anode and filament, as well as direct heat; /archives//html/Amps/1997-04/msg00106.html (8,373 bytes)
11. [AMPS] Triton 3-500Z's (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 04 Apr 1997 10:46:53 -0500; That agreement is in effect today. Only a few companies who purchased tubes from Eimac before the agreeement are exempt. Richardsons bought out every source of competition they could. In my opinion (; /archives//html/Amps/1997-04/msg00105.html (7,594 bytes)
12. [AMPS] An Idea for a New Feature @ Dayton (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 04 Apr 1997 08:37:40 -0500; Lee, If I don't have the freedom to correct technical mis-statements in a non-personal way let me know, I'll sign out. I suggest you go back and read the posts, and see who is replying on a technical; /archives//html/Amps/1997-04/msg00088.html (8,187 bytes)
13. [AMPS] : Drake L-7 Manual Error (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 03 Apr 1997 11:12:46 -0500; Hi Carl, How does idling current tie directly into gain, instability, or arcing? Why is it important? 73 Tom -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Admi; /archives//html/Amps/1997-04/msg00063.html (7,053 bytes)
14. [AMPS] What's a dB (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 03 Apr 1997 08:48:20 -0500; There are two type of measurements we can make, one is subjective (it relies on improper instrumentation, our human senses, and "gut feelings". Subjective measurements usually produce pathological sc; /archives//html/Amps/1997-04/msg00061.html (7,119 bytes)
15. [AMPS] HV Power Supply Capacitors (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Tue, 01 Apr 1997 18:42:10 -0500; Hi Carl, The catalog I have lists them both at the same temperature range. Type LP has a higher temperature range, but much more leakage current than the CGS or LX series. The maximum temperature ran; /archives//html/Amps/1997-04/msg00020.html (9,993 bytes)
16. [AMPS] HV Power Supply Capacitors (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 23:58:16 -0500; My point was the larger size capacitor dissipates heat better, and has a higher ripple current rating for a given capacitance. The "ancient" CGS style 380 mfd used in Ameritron supplies has a ripple; /archives//html/Amps/1997-03/msg00005.html (8,323 bytes)
17. [AMPS] CLASSes of amps. (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 08:55:43 -0500; Looking at the classes commonly used in amateur service, they are divided by grid current and conduction angle. Conduction angle is the letter designations,and grid current is the number. Remember th; /archives//html/Amps/1997-03/msg00356.html (8,930 bytes)
18. [AMPS] HV Power Supply Capacitors (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 08:17:26 -0500; Common sense tells us the larger an object, the more heat it can dissipate. If you have two capacitors with equal ESR, and one has a much larger surface area, the larger one will be able to dissipate; /archives//html/Amps/1997-03/msg00355.html (7,857 bytes)
19. [AMPS] Re: 3-500Z/ G (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 31 Mar 1997 00:28:49 -0500; Two sections are paralleled, and the contact arrangement is changed. It is not a standard JV series. Again the contact arrangement is changed. The ten meter tap is moved away from the grounded mounti; /archives//html/Amps/1997-03/msg00349.html (9,722 bytes)
20. [AMPS] TL-922 at 4000 V (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sun, 30 Mar 1997 23:22:28 -0500; The TL-922 was designed under the old 1 kW dc input guidelines. It's pretty easy to get a 3-500Z amp to hold up and behave at voltages less than 3 kV. Raise the voltage much over 3500 volts, and you; /archives//html/Amps/1997-03/msg00348.html (7,540 bytes)

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